I agree with @Uzo , as far as I now you cannot have the user select an image, allow the user to crop and then confirm the upload.
Have you considered preset CSS settings? (@hisashi.fujita )
You could also maybe use Cloudinary to do quite a bit of editing of your images. Have you looked into this? There are quite a few topics around Cloudinary, here is one of them.
Here is what I am trying to accomplish, with partial, but not complete success.
Upload an image (usually square and meant for Instagram)
Use that image and Cloudinary transformations to create 7 different versions of the graphic for a variety of social media sites.
Preview the transformed images in the app so the artist can review.
Text input for client to add caption text to be uploaded with image.
Choose date for the post, or leave blank to post now.
Allow editing of trending hashtags loaded…
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